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Security audit

draw.io MCP

Security checks for vulnerabilities and agentic risk

Overview

The skill is mostly coherent for using draw.io through OOMOL, but its first-time setup tells the agent to execute a remotely fetched installer script without integrity verification.

Review the installer step before using this skill. It is reasonable for the skill to need the OOMOL CLI, but users should prefer official, verified installation instructions and should not let an agent run remote installer scripts automatically. Connector actions should still be limited to the requested draw.io task and confirmed before any future write or destructive action is run.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

External Script Fetching

High
Category
Supply Chain
Confidence
93% confidence
Finding

The skill instructs the agent to install software by piping a remotely fetched script directly into a shell (curl ... | bash). This is dangerous because it executes unverified code from the network with the user's privileges, enabling supply-chain compromise, MITM-related execution in weaker trust environments, or malicious changes on the hosting server to become instant code execution.

Content

Scanner excerpt · SKILL.md (reported line 56)May include surrounding context.

Static analysis

No suspicious patterns detected.